S-A node of the mammalian heart is known as

Question

Question

This question was previously asked in

RRB Pharmacist Previous Year Paper 2015

Answer 1

Correct Answer: Pace-maker

Rationale:

The S-A node, or sinoatrial node, is a small body of specialized muscle tissue in the wall of the right atrium of the heart.
It acts as the natural pacemaker of the heart by generating electrical impulses that initiate each heartbeat.
These electrical impulses cause the atria to contract and push blood into the ventricles, setting the rhythm and rate of the heartbeat.
The S-A node ensures that the heart beats in a coordinated and rhythmic manner, which is crucial for effective blood circulation throughout the body.

Explanation of Other Options:

Autoregulator

Rationale: The term "autoregulator" is not specific to the heart. It generally refers to mechanisms that automatically regulate a physiological process, such as blood flow or hormone levels, but it is not the term used for the S-A node.

Time controller

Rationale: "Time controller" is not a recognized term in cardiology. While the S-A node does control the timing of the heartbeat, this term is not used in medical terminology to describe it.

Beat regulator

Rationale: While this term might seem appropriate since the S-A node regulates heartbeats, "beat regulator" is not the standard term used in medical science. "Pacemaker" is the correct and widely accepted term.

Conclusion:

The S-A node is correctly referred to as the "pacemaker" of the heart. It plays a crucial role in maintaining the heart's rhythm and ensuring proper blood circulation.